B: Zero-copy cloning in Snowflake allows for efficient creation of clones that share the underlying storage and metadata with the original object. However, if developers need to work with production data that has specific columns masked (potentially using different views or transformations), a direct copy of the data may be necessary to apply these transformations without affecting the original production data. C: When developers require a separate Snowflake account for development and testing purposes, especially in scenarios where they need to work independently and may need to modify the data structure or content significantly, a copy of the production data into the development/testing account ensures isolation and control over their own environment. Zero-copy cloning does not provide this level of isolation between different Snowflake accounts.